WO1994027242A1 - Lecteur de marque optique pour marque d'image latente - Google Patents

Lecteur de marque optique pour marque d'image latente Download PDF

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Publication number
WO1994027242A1
WO1994027242A1 PCT/JP1994/000778 JP9400778W WO9427242A1 WO 1994027242 A1 WO1994027242 A1 WO 1994027242A1 JP 9400778 W JP9400778 W JP 9400778W WO 9427242 A1 WO9427242 A1 WO 9427242A1
Authority
WO
WIPO (PCT)
Prior art keywords
latent image
image mark
optical
mark
light
Prior art date
Application number
PCT/JP1994/000778
Other languages
English (en)
Japanese (ja)
Inventor
Masato Nishida
Tomoaki Ishituka
Toshio Oshima
Original Assignee
Hitachi Maxell, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Maxell, Ltd. filed Critical Hitachi Maxell, Ltd.
Priority to US08/367,355 priority Critical patent/US5668363A/en
Priority to EP94914617A priority patent/EP0652529A4/fr
Publication of WO1994027242A1 publication Critical patent/WO1994027242A1/fr

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10554—Moving beam scanning
    • G06K7/10594—Beam path
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/12—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using a selected wavelength, e.g. to sense red marks and ignore blue marks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S283/00—Printed matter
    • Y10S283/901—Concealed data

Definitions

  • the present invention relates to a latent image mark optical reading device that emits infrared rays to a latent image mark including a phosphor and optically detects light emitted from the latent image mark. More specifically, the present invention relates to a handy type optical reading apparatus, in which the optical reading apparatus is brought into contact with or close to an object such as a product having the latent image mark, and the information of the latent image mark is read.
  • the present invention relates to an arrangement relationship between a light projecting member and a light receiving member of an optical reader for reading.
  • a printing ink containing carbon black is generally used, and a barcode is printed on the surface of the paper with the ink, and the barcode is printed on a portion where the barcode is printed.
  • a barcode reader optically detects the difference in light reflectance from the part, and reads the code information of the barcode.
  • This reflective bar code is printed on the surface of a product or the like, so that the appearance of the product or the like is impaired. It has the drawback that the difference is small and causes reading errors.
  • FIG. 12 is a view for explaining a conventional optical reader of this type.
  • Ba A latent image mark such as a code is printed on a mark carrier 101 such as a product or a part.
  • the latent image mark 100 contains phosphor fine particles, and light for exciting this phosphor is radiated from the light projecting member 103, and accordingly, from the latent image mark 100. Fluorescent light is emitted, and the fluorescent light is emitted by the light receiving member 104 so that the code information of the latent image mark 100 is optically read.
  • the present inventors have found that the intersection angle of the optical axis of the light projecting member 103 and the light receiving member 104 of the optical reading device and the latent image mark 100 of the mark carrier 101 are different. It has been clarified that the state of the printed surface greatly affects the reading accuracy.
  • the optical reading device is mechanically fixed at a predetermined position, a latent image mark 100 is printed on a mark carrier 101 such as paper, for example, with a flat surface, and the mark carrier 101 is optically printed.
  • a guide member provided in the reader, the distance between the light emitting member 103 and the latent image mark 100 and the distance between the light receiving member 104 and the latent image mark 100 are always constant. In this case, as shown in FIG. 12, even if the crossing angle 0 of the optical axis of the light projecting member 103 and the light receiving member 104 is 45 ° to 60 °, the latent image mark 100 Can be read relatively accurately.
  • the optical reading device is a hand-operated type, the reading position of the light receiving member 104 with respect to the latent image mark 100 varies, or the optical reading device detects the position of the latent image mark 100 with respect to the surface of the latent image mark 100.
  • the opening surface is slanting or moving.
  • the surface state of the mark carrier 101 on which the latent image mark 100 is printed is irregular, such as a confectionary bag. If there is a part or part with a curved surface or a step, the distance between the light emitting member 103 and the latent image mark 100 and the distance between the light receiving member 104 and the latent image mark 100 The distance will be uneven.
  • the intersection angle 0 of the optical axis of the light projecting member 103 and the light receiving member 104 becomes 45 ° as in the related art. ⁇ 60.
  • the code information of the latent image mark 100 could not be read accurately, causing false detection.
  • an object of the present invention is to solve the above-mentioned drawbacks and provide a highly reliable latent image mark optical reading device capable of accurately reading code information of a latent image mark.
  • a projection device that emits light having a wavelength that excites the phosphor on a latent image mark surface that contains the phosphor and has desired information.
  • An optical member, and a light receiving member for receiving fluorescence emitted from the latent image mark surface, and a latent image mark readable range is defined based on a point where an optical axis of the light projecting member and an optical axis of the light receiving member intersect. It is configured such that the intersection angle between the two optical axes is restricted to 40 ° or less.
  • the present invention narrows the intersection angle between the optical axis of the light projecting member and the optical axis of the light receiving member on the latent image mark to 40 ° or less to thereby reduce the light projecting member and the light receiving member.
  • the effect of the irregular distance between the image and the latent image mark can be minimized.
  • it is suitable for handy optical readers, and it can read not only those with flat surfaces but also irregular surface irregularities, curved surfaces, and mark carriers with steps.
  • An optical reading device that can be obtained is obtained.
  • FIG. 1 is a plan view in which a part of a handy type optical reader according to an embodiment of the present invention is cut away,
  • FIG. 2 is a cross-sectional view of the optical reader of FIG.
  • FIG. 3 is a plan view showing a state in which an upper frame of a light receiving unit used in the optical reader of FIG. 1 is removed.
  • FIG. 4 is a sectional view of the light receiving unit of FIG.
  • FIG. 5 is a schematic diagram for explaining the optical system of the optical reader of FIG. 1
  • FIG. 6 is a schematic diagram for explaining the optical system of the optical reader of FIG. 1
  • FIG. FIG. 4 is a characteristic diagram showing a relationship between a latent image mark position and an output state of a light receiving element.
  • FIG. 8 is a characteristic diagram showing a relationship between an optical axis crossing angle of the light emitting element and the light receiving element and a readable distance of the latent image mark.
  • FIG. 9 is a diagram showing an output state of the optical reader when the mark carrier surface is flat
  • FIG. 10 is a diagram showing an output state of the optical reading device when the mark carrier surface is uneven
  • FIG. 11 is a diagram showing an output state of the optical reading device when the mark carrier surface is curved
  • FIG. 12 is a schematic diagram of a conventional optical reading device.
  • FIG. 1 is a plan view of a part of the handy type optical reader according to the above embodiment
  • FIG. 2 is a sectional view of the optical reader
  • FIG. 3 is a light receiving unit used in the optical reader.
  • FIG. 4 is a cross-sectional view of the light receiving unit
  • FIGS. 5 and 6 are schematic diagrams for explaining an optical system of the optical reading device.
  • the handy type optical reader includes an upper case 1, a lower case 2, an aperture frame 3, a light projecting element 4, a mirror 5, and an imaging lens group 6. , An optical filter 7, a light receiving element 8, a control board 9, and a switch 10.
  • the upper case 1 and the lower case 2 are formed in a shape that is easy to hold as shown in FIG. 1, and the switch 10 is installed at a position where the optical reader can be operated while being held by hand. . '
  • the light projecting element 4 is an array having a large number of LED elements arranged in a line, and a lens body 11 is provided on the light projecting surface side.
  • the light emitting element 4 is supported on a printed circuit board 12, and the printed circuit board 12 is accurately fixed to the lower case 2, though not shown.
  • the control board 9 and the print board 12 are electrically connected by a signal line 13.
  • the array-like light projecting element 4 is fixed near the aperture detection surface of the optical reader, and emits light, for example, to a bar code-like latent image mark 15 printed on the surface of the mark carrier 14. Is irradiated. As shown in FIGS. 2 and 6, the optical axis of the light emitting element 4 should intersect at 15 ° with the normal to the surface to be detected (in the case of a flat surface) on which the latent image mark 15 is formed. In addition, the light emitting element 4 is fixed.
  • Infrared rays are emitted from the light emitting element 4, thereby exciting the phosphor fine particles mixed in the latent image mark 15, and thereby having infrared rays having a different center wavelength than the infrared light from the light emitting element 4. (Fluorescence).
  • This fluorescent light The light is reflected by the mirror 5 arranged on the normal line of the surface 15 and is received by the light receiving element 8 through the imaging lens group 6 and the optical filter 7.
  • the optical filter 7 has an optical characteristic of blocking infrared rays emitted from the light projecting element 4 and transmitting infrared rays emitted from the latent image mark 15.
  • the optical filter is composed of, for example, a single crystal substrate of indium phosphide (InP).
  • the light receiving element 8 is formed of an array in which a large number of CCDs are arranged in one row.
  • the detection signal from the light receiving element 8 is input to the control board 9 and, after signal processing and the like, is input to a personal computer (not shown) through the cable 16.
  • the mirror 5, the imaging lens group 6, and the light receiving element 8 are sandwiched and positioned between the upper frame 17 and the lower frame 18 as shown in FIGS. 3 and 4 so as to maintain appropriate intervals.
  • the latent image mark 15 mounted in the lower cases 1 and 2 is composed of fluorescent fine particles and a binder having a property of transmitting infrared rays and dispersing and holding the fluorescent fine particles.
  • Examples of the phosphor include neodymium (Nd), ytterbium (Yb), europium (Eu), thulium (Tm), and praseodymium.
  • inorganic compounds contained in the mother specifically, there is NdP 5 0 14, L i NdP 4 0 12, NaY 0. 69 Yb 0. 3 inorganic compound such as E r 0 .o F 4.
  • an inorganic compound represented by the following general formula can also be used.
  • Ln in the formula represents at least one element selected from the group consisting of Bi, Ge, Ga, Gd, In, La, Lu, Sb, and Sc.
  • A represents one or more elements selected from the group K. Na, and M represents one or more elements selected from the group W and M0.
  • D is at least one element selected from the group consisting of A 1 and Cr.
  • A represents one or more elements selected from the group of K, Na.
  • ⁇ ' is one or more elements selected from the group of L i. ⁇ , Na,
  • M represents one or more elements selected from the group of W and M0.
  • an inorganic compound represented by the following general formula can also be used.
  • E in the formula is one or more elements selected from the group of L i, Na, K, Rb, C s,
  • F in the formula represents one or more elements selected from the group of Sc, Y, La, Ce, Gd, Lu, Ga, In, Bi, and Sb.
  • X and y in the formula are numerical values in the following range. 0.05 ⁇ x ⁇ 0.999
  • At least one element selected from the group of Y, La, Gd, and Bi, and phosphates, borates, molybdates, tungstens, etc., containing Yb Oxygen salts, specifically, inorganic compounds having the following general formula can also be used.
  • a in the formula is one or more elements selected from the group of Li, Na, K, Rb, and Cs, and is not necessarily required.
  • X is a number in the range from 0.01 to 0.99
  • y is a number in the range 2 to 5
  • z is a numerical value in the range of 7-14.
  • the content of the phosphor fine powder is suitably from 10 to 80% by weight, particularly preferably from 25 to 70% by weight. If the content of the phosphor fine powder is less than 10% by weight, the emission output of the latent image mark 15 is too weak, while if the content of the phosphor fine powder exceeds 80% by weight, printing is difficult. There is a fear that the latent image mark 15 may be peeled off due to weak adhesion.
  • the binder may be a non-solvent type such as an ultraviolet curable resin, a solvent type such as a polyurethane, or a polyvinyl alcohol (PVA). Any water-soluble type can be used, and it is appropriately selected according to the printing method, the material of the detection target, and the like. In addition, a plasticizer, a surfactant, and the like are appropriately added as needed.
  • a non-solvent type such as an ultraviolet curable resin, a solvent type such as a polyurethane, or a polyvinyl alcohol (PVA).
  • PVA polyvinyl alcohol
  • Any water-soluble type can be used, and it is appropriately selected according to the printing method, the material of the detection target, and the like.
  • a plasticizer, a surfactant, and the like are appropriately added as needed.
  • the focal length of the lens body 11 is designed to be slightly ahead of the detection opening so that it can be read.
  • the intersection angle 0 between the optical axis of the light emitting element 4 and the optical axis of the light receiving element 8 on the latent image mark 15 is set to 15 ° as described above, and 11 If the position where the latent image mark 15 is located at the focal length of 1 is the latent image mark position O mm (reference position), and the latent image mark 15 is moved closer to the device side from that position or away from it, The change in the output voltage of the light-receiving element 8 was measured, and the results are shown in FIG.
  • the horizontal axis represents the position of the latent image mark 15
  • the left vertical axis represents the output voltage value of the light receiving element 8
  • the right vertical axis represents the output voltage of the light receiving element 8 when the latent image mark position is 0 mm.
  • the output efficiencies in the case of 0 are shown respectively.
  • the readable distance is about +10 mm, which is about +10 mm at the position where the output efficiency is 50%, that is, about the reference position. It is in the range of 0 mm (about 20 mm).
  • the readable range of the latent image mark is formed so as to start from the outer end face of the detection opening for emitting and receiving light and to extend about 2 Omm in a direction away from the opening.
  • FIG. 8 is a diagram summarizing the measured readable distance (the position where the output efficiency of the light receiving element 8 is 50%) when the crossing angle 6 is variously changed.
  • the readable distance is extremely reduced as the intersection angle 6 increases.
  • the crossing angle 0 is 45 ° as in the past, the maximum readable distance is 5 mm ( ⁇ 2.5 mm) or less, and when the surface is uneven as in the confectionery bag described above, or Reading the latent image mark 15 on a curved surface with a short radius of curvature is uncertain.
  • the height difference in the natural state of the surface of the product is about 6 mm ( ⁇ 3 mm) on average, such as a confectionery bag.
  • the reading distance of the latent image mark 15 is assured if the reading distance is within the range.
  • the crossing angle ⁇ is 15 °
  • the readable distance is 10 mm (twice that when the conventional crossing angle 0 is 45 °), and the readable distance is 20 mm (if the conventional crossing angle is 45 °). 4 times). Therefore, it is preferable that the crossing angle be 30 ° or less, but the narrowing of the crossing angle 0 means that the dimensions and dimensions of each optical system component such as the light-emitting element 4, the mirror 1, the imaging lens group 6, and the light-receiving element 8 It is desirable to restrict the crossing angle 0 to the range of 10 ° to 30 because the conditions such as arrangement become severe.
  • the bar code-like latent image mark 15 with a minimum width of 0.5 mm is printed on the paper on which the mark is printed.
  • Figure 9 shows the output state when the paper surface is flat.
  • Fig. 10 shows the output state when the average height of the surface difference in the area where the latent image mark 15 is formed is approximately 6 mm ( ⁇ 3 mm) by forming wrinkles on the paper. It is.
  • FIG. 6 is a diagram showing an output state when reading at (°) (a distance to a barcode is 6 mm).
  • the present invention is also applicable to an optical reader using an ultraviolet excitation type phosphor which is excited by irradiating ultraviolet rays. It is.
  • the former is advantageous in terms of security because the fluorescence is visible light, whereas the latter is not visible light. Due to the long life of the phosphor, infrared-excited phosphors can be awarded.
  • the present invention provides a latent image based on a point at which the optical axis of a light emitting member (for example, the light emitting element 4) and the optical axis of a light receiving member (for example, the light receiving element 8 and the optical frame 7) intersect.
  • a mark readable range is formed, and the intersection angle of the two optical axes is narrowed to 40 ° or less to make the angle narrow, so that the distance between the light emitting member and the latent image mark and the light receiving member and the latent image mark are reduced.
  • the effect of uneven distance to It can be less powerful.
  • it is suitable for handy optical reading devices-and it can read not only flat surfaces but also irregularly uneven surfaces, mark carriers with curved surfaces or steps, etc.
  • An optical reading device with high reliability can be provided.

Abstract

Lecteur de marque optique de haute fiabilité pour marque d'image latente capable de lire avec précision des informations de code d'une marque d'image latente. Le lecteur comprend un élément projecteur (4) destiné à projeter sur la surface de la marque (15) d'image latente, lequel contient une substance fluorescente et présente des informations spécifiées, la lumière ayant une longueur d'onde destinée à exciter la substance fluorescente, ainsi qu'un élément (8) récepteur de lumière destiné à recevoir une fluorescence émise à partir de la surface de la marque (15) d'image latente. Une plage dans laquelle une marque d'image latente est lisible est définie à l'aide d'une intersection d'axes optiques de l'élément projecteur et de l'élément récepteur de lumière servant de référence, et un angle de passage (υ) des deux axes optiques est limité à 40° ou moins.
PCT/JP1994/000778 1993-05-17 1994-05-13 Lecteur de marque optique pour marque d'image latente WO1994027242A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US08/367,355 US5668363A (en) 1993-05-17 1994-05-13 Optical reading apparatus for reading latent image mark
EP94914617A EP0652529A4 (fr) 1993-05-17 1994-05-13 Lecteur de marque optique pour marque d'image latente.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5114614A JPH06325200A (ja) 1993-05-17 1993-05-17 潜像マークの光学読取装置
JP5/114614 1993-05-17

Publications (1)

Publication Number Publication Date
WO1994027242A1 true WO1994027242A1 (fr) 1994-11-24

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ID=14642268

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1994/000778 WO1994027242A1 (fr) 1993-05-17 1994-05-13 Lecteur de marque optique pour marque d'image latente

Country Status (4)

Country Link
US (1) US5668363A (fr)
EP (1) EP0652529A4 (fr)
JP (1) JPH06325200A (fr)
WO (1) WO1994027242A1 (fr)

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US8968662B2 (en) 2008-06-23 2015-03-03 Freshpoint Quality Assurance Ltd. Time temperature indicator
US9011794B2 (en) 2007-01-11 2015-04-21 Freshpoint Quality Assurance Ltd. Time temperature indicator
US9448182B2 (en) 2004-11-08 2016-09-20 Freshpoint Quality Assurance Ltd. Time-temperature indicating device
US9835498B2 (en) 2003-11-20 2017-12-05 Freshpoint Quality Assurance Ltd. Method and system for determining the condition of a time-temperature indicator

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US6091563A (en) * 1997-09-26 2000-07-18 Iomega Corporation Latent illuminance discrimination marker system for data storage cartridges
US6181662B1 (en) 1997-09-26 2001-01-30 Iomega Corporation Latent irradiance discrimination method and marker system for cartridgeless data storage disks
US6359745B1 (en) 1997-09-26 2002-03-19 Iomega Corporation Latent illuminance discrimination marker system for data storage cartridges
US6264107B1 (en) 1997-09-26 2001-07-24 Iomega Corporation Latent illuminance discrimination marker system for authenticating articles
US6201662B1 (en) 1998-09-25 2001-03-13 Iomega Corporation Latent illuminance discrimination marker with reflective layer for data storage cartridges
US6028320A (en) * 1998-01-20 2000-02-22 Hewlett-Packard Company Detector for use in a printing device having print media with fluorescent marks
US6255665B1 (en) 1999-01-29 2001-07-03 Hewlett-Packard Company Print media and method of detecting a characteristic of a substrate of print media used in a printing device
US6450634B2 (en) 1999-01-29 2002-09-17 Hewlett-Packard Company Marking media using notches
DE10027726A1 (de) * 2000-06-03 2001-12-06 Bundesdruckerei Gmbh Sensor für die Echtheitserkennung von Signets auf Dokumenten
US6832729B1 (en) 2001-03-23 2004-12-21 Zih Corp. Portable data collection device for reading fluorescent indicia
CN108664827A (zh) * 2017-04-02 2018-10-16 田雪松 一种编码信息获取方法和系统
CN108664826A (zh) * 2017-04-02 2018-10-16 田雪松 一种编码信息读取装置

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Publication number Priority date Publication date Assignee Title
US9835498B2 (en) 2003-11-20 2017-12-05 Freshpoint Quality Assurance Ltd. Method and system for determining the condition of a time-temperature indicator
US9448182B2 (en) 2004-11-08 2016-09-20 Freshpoint Quality Assurance Ltd. Time-temperature indicating device
US9011794B2 (en) 2007-01-11 2015-04-21 Freshpoint Quality Assurance Ltd. Time temperature indicator
US10145826B2 (en) 2007-01-11 2018-12-04 Freshpoint Quality Assurance Ltd. Time temperature indicator
US11280772B2 (en) 2007-01-11 2022-03-22 Freshpoint Quality Assurance Ltd. Time temperature indicator
US8968662B2 (en) 2008-06-23 2015-03-03 Freshpoint Quality Assurance Ltd. Time temperature indicator

Also Published As

Publication number Publication date
EP0652529A1 (fr) 1995-05-10
US5668363A (en) 1997-09-16
JPH06325200A (ja) 1994-11-25
EP0652529A4 (fr) 1998-12-09

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